OWNER TO mega patch #2

Hi,

This is the final patch that adds OWNER TO commands to every object.
This includes tablespaces.  I have also added RENAME TO on tablespaces.

Full docs changes are included (+ 3 new files that must be put in
doc/src/sgml/ref).

All new regression tests included also.

Please review and apply this soon so that I can fix pg_dump to use these
new commands before the 30th :)

Cheers,

Chris